Malicious PDF — malware analysis report

Static analysis result for SHA-256 699612891df48d64…

MALICIOUS

PDF

87.1 KB Created: 2021-09-14 09:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d927aa478cc1cb6ce49dddc6a1e6efc9 SHA-1: a45ef4dc357a0a2555811cf222387d6c0111d21c SHA-256: 699612891df48d64cd1e18292d402c774b82378e52e9bddc55450242a257fa01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO poisoning campaign. The document body is heavily obfuscated and unreadable, but the presence of multiple distinct hosts and links per host indicates a deliberate effort to distribute content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://simsvizag.com/admin/uploadedfiles/file///98142042430.pdf In PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/gemawoxivifikatakoduvogim.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zotemowanosupuwisogoni.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/97911290902.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/kevifurewi.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/48178533967.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/sekemepamobugope.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uv1t3l0m8qqg08r3i8e9klgqn7/20982247768.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd537ec7a---nipuwonukotavuluwukejawe.pdfIn PDF document text
    • http://trubaopt.ru/content/file/1734137964.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/dakugowexukopa.pdfIn PDF document text
    • http://szjg.hu/images/file/37328214570.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/31082349293.pdfIn PDF document text
    • http://naso10.com/userData/board/file/93945589585.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/60386694897.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/gidawuramikajeketovubo.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/lolagilatovo.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/zufinanenebo.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/95265236502.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/19771300899.pdfIn PDF document text
    • https://duel.pl/userfiles/file/fenumiwajabokoma.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/lekotemufiluf.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/5802301377.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/ranafokajanan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bossa+nova+chord+progressions+pdfPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/vuvudisutuzepol.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 10872 bytes
SHA-256: b8fdcc1d0bc74d0f2c92a04c658b13514491bf3b0bf854e88c56966e621b318e
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 18464 bytes
SHA-256: 32c36515bfc6474c43f6f5bc9872c21cf272938570ba7c95ddd342c73e5abc4e